Window locking device



July 31,-1945.

T. HANNON WINDOW LOCKING DEVICE Filed March 27, 1944 'INVENTOR' To/berf Hazy/won HIS ATTORNEY Patented .lulyiil, 1945 w momma nsvros Talbert Harmon, San Francisco, Calif. Application March 27, 1944, Serial No. 528,273

Claims.

My invention relates to window locks, and particularly to a locking device which will limit the distance a window sash may be opened, and

- thereby serve to lock the window in a partially opened position.

It is among the objects of my invention to provide a window locking device which may be applied to window sashes to provide means whereby the window may be locked in either a closed or a partially open position.

Another object is to provide a locking device having a chain arranged to limit the distance a window sash may be opened, and having means sash l.

of my invention comprises a plate 2 arranged to be secured to a movable sash i. A chain 3 has its ends secured to the plate 2 by means of ears or lugs 4 adjacent the ends thereof. A flange 5 extends from the plate 2, at substantiallyright angles thereto, along the forward edge of the plate opposite the lugs 4. An opening 6 is formed in the flange 5.

The plate 2 has openings 8 therein spaced to receive the screws I by which the hook member 9 of an ordinary window 'lock is secured to the The plate is preferably applied under the member 9, where it is held by the screws 1 for preventing the chain from interfering with h the closing of the window.

Another object is to'provide a chain mounting means which may be readily mounted in connection with theordinary form of window lock, without interfering with the operation of such lock in the ordinary manner.

My invention possesses other objects and features of value, some of which with the foregoing will be set forth in the following description of the invention. It is to be understood that I do not limit myself to the showing made by the said description and the drawing as I may adopt variant forms of the invention within the scope of the appended claims.

In the drawing:

Figure 1 is an isometric projection of the chain and chain mounting fitting of my invention, part of the chain being broken away.

Figure 2 is a transverse section through the adjoining rails of a pair of window sashes, illustrating the locking device of my invention applied thereto.

In terms of broad inclusion, the window look ing device of my invention comprises a chain having its ends secured to a movable sash and its length double to form a loop for engaging a fastening upon a companion sash, or other adjacent object, to limit the distance either sash can be moved from its closed position. Preferably the chain is secured to the sash by means of a plate, secured under one of the "fittings of an ordinary window lock, and having spaced lugs to which the ends of the chain are secured. A flange extends upwardly between the lock members for supporting the loop portion of the chain, the flange having an openingthrough which the cam portion of the ordinary lock may-be operated to lock the sashes in closed relation. Preferably means are provided for preventing the chain from slipp oi! the ends 01 the flange.

without requiring separate securing means.

The flange 5 extends upwardly between the hook member 8 and the cam member H) of the window lock. The opening 6 of the flange 5 is :shaped and positioned to permit the cam member II to extend through the flange, and to engage and interlock with the hook 9 in the ordinary manner. Thelcam member ID is provided with the usual handle H by which it is operated, and is pivoted upon the usual base l2, screwed or otherwise secured to a sash l4 adjoining and cooperating with the sash l.

The chain 3 forms a loop which extends over the flange 5 into engagement with a hook or other suitable fastener l5 secured to the sash I 4. The loop forined .by the chain 3 normally hangs downwardly past the sash rail l4 and hook l5, while the cam ll extends through the opening 6 to interlock with the hook 8, as shown in Figure 2 of the drawing, for locking the sashes in closed relation.

When it is desired to lock the windows in partially opened relation, the cam member In is moved to disengage the hook 9 and to clear the flange 5. As either or both sashes are moved in the opening direction, the end of the chain loop is engaged by the hook i5, and limits the distance the sashes may be moved relative to each other. The chain normally permits an opening of only a very few inches. If desired the chain may be hooked onto the hook l5, through one of its links, to provide a shorter range of movement; or the chain may be given one or more turns around the hook ll to-shorten its-effective length.

The flange 5 provides a guard which holds the chain clear of the lock members 9' and it), so as to prevent interference with the normal operation thereof. Also, the flange I prevents slack in the chair: I from dropping into the space between the sashes in such a way as to obstruct their return to closed positions. Ears may be In terms or greater detail, the locking device 15 p d d on t e uppe co n or e flanse ix to prevent the chain from slipping on! either end of the flange.

The device may be applied in new installations by merely placing the plate 2 under the hook member 9 as it is being installed upon the sash I.

In old installations, the device may be installed by removing the screws which secure the hook member 9 to the sash, next inserting the plate 2 under the hook member, and then replacing the screws I to secure both the hook member and the plate to the sash I. In general, the thickness of the plate 5 does not aflect the securing and operation of the ordinary lock members 9 and '0, except perhaps to require the cam member In to be turned, slightly farther before effecting of the plate, a chain having its ends secured to.

the chain engaging means and doubled to form a loop extending over the flange, and a hook upon the adjoining upper rail of a companion lower looking engagement with the hook 9. If desired,

a locking the sashes against movement in the opening direction beyond the limit fixed by the length of the chain. When it is desired to open the window beyond the limits of the chain 3, the chain loop is held out of engagement with the hook (I while the sashes are moved to the desired position. As the sashes are retumed to closed position, the chain loopis returned to normal position passing around the hook I5.

I claim:

1. A locking device for window sashes comprising a chain secured at one end to one of a pair of relatively movable sashes, means upon the other sash'engaging the other end of the chain at a point for limiting movement of either sash, and a guard mounted upon one of the sashes and projecting upwardly therefrom along the meeting edges of the sashes for engaging and supporting the chain at a point between said ends.

2. A locking device for window sashes comprising a plate arranged to be secured to a movable window sash, a flange upon the plate projecting upwardly therefrom along its forward edge, chain engaging lugs upon the rearward edge of the plate, a chain having its ends secured to the lugs sash for engaging the loop to limit relative movement of the sashes.

4. A window locking device for limiting opening movement of a pair of relatively movable window sashes having adjoining rails provided with interengageable hook and cam members for locking the sashes in closed relation, said device comprising a plate mountable upon one sash under one of the locking members, a flange upon the plate positioned to extend upwardly between the lock members and having an opening through which the cam member may be moved to lock the window, chain engaging means upon the plate in back of the flange, a chain having its ends secured to the chain engaging means and doubled to form a loop extending over the flange, and means mountable upon the other sash for engaging the loop to limit relative movement of the sashes.

5. A window locking device for limiting opening movement of a pair of relatively movable window sashes having adjoining rails provided with interengageable hook and cam members for looking the sashes in closed relation, said device comprising a plate mountable upon one sash under-one of the locking members, a flange upon 40 the plate positioned to extend upwardly between 

